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Distributor advance vacuum point - before or after the throttle 140-160

posted by  Phil S. on  Sun Jan 16 18:50 CST 2011
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last visit: Fri Oct 24 13:18 CST 2014
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Really makes no difference at all once the throttle is opened 1/10th of the way. Hooking up to the manifold will tend to give you a smoother idle, which really helps if you have an aggressive cam.

Obviously, if you hook to the manifold you need to set initial timing with the vacuum disconnected. I have an advance dizzy hooked up that way on our Amazon with a stock B20E (not an aggressive cam), and it idles fine at ~20BTDC with the vacuum full on. Once the throttle opens, it retards -- and it should -- and then you're on the same curve as if you'd hooked it outboard of the throttle.






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